Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur télécharger pdf (Page 156)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

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308628-15.0 Rev 00

The following conditions must apply:

• The local BGP router and the remote BGP router must be connected by

multiple links.

• IP must be configured on a circuitless (virtual) interface on both the local and

remote routers.

• The EBGP speaker on the local router and the EBGP speaker on the remote

router must establish a peer-to-peer session using their circuitless (virtual) IP

interfaces. For information, see Chapter 4, “

Configuring BGP Peers.”

• The local IP routing table must contain multiple equal-cost routes to the

circuitless interface of the router in the remote AS. These ECMP routes are

typically submitted statically, but they could also be submitted by OSPF or

RIP.

In Figure 7-4

, for example, two BGP routers located in different ASs are

connected by two physical links.

Figure 7-4. ECMP Static Routes

IP0090B

Local AS Remote AS

EBGPEBGP

IP circuitless interface

Peer-to-Peer Session

Key

ECMP static routes

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 275 276

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 156